Find the sum of the first 30 poistive integers divisible by 6
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30/2 x (6 + 180)
= (30 x 186)/ 2
= 5580/2
6 + 12 + 18 + 24 + 30 + 36 + 42 + 48 + 54 + 60 + . . . . + 180 = 2790
Therefore, 2790 is the sum of first 30 positive integers which are divisible by 6.
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